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I am sure it's not the case because sometimes I also have free bets, but I never have any email about these free bets mostly when I login then I check in inbox or while I am placing bets then suddenly option appear about my free bets.
Yes, FortuneJack gives freebets in many occasions and celebrations, for the anniversary of creation of the account for example, the times of lockdown ....
Maybe that you have just the option of receiving messages on email disabled, then you need to look into your FJ inbox the see the corresponding message.